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Lvch blockchain
Publish: 2021-04-09 16:55:09
1. Your question seems to involve single chip microcomputer, which is troublesome to explain http://www.mcuresource.com/bbs/simple/index.php?t238.html
2. You don't agree, because after you choose who, other people will fix your eyes and prove that you can't get what you want!
3. The working voltage of sn74lvch16t245 is 1.65v to 5.5V
the working voltage of sn74lvch16t245 is 1.65v to 3.6V
the thermal resistance of the two chips is different
it can be said that sn74lvch16t245 is a low voltage version
the working voltage of sn74lvch16t245 is 1.65v to 3.6V
the thermal resistance of the two chips is different
it can be said that sn74lvch16t245 is a low voltage version
4. First of all, it depends on whether your sensing distance is required. If it is within 1 meter, you can use the diffuse reflection photoelectric switch, which is powered by 5VDC or 10-30vdc. If the distance is far, you can choose to shoot the switch at a distance of 5-100 meters. As long as the infrared light is blocked, the switch will output a high level signal. You can use the high level to drive a low-power buzzer (the carrying current of the infrared photoelectric switch is about 100 mA), or drive the relay coil, and then use the coil to drive a high-power buzzer. The price is very cheap, about 25 yuan for 5V photoelectric switch, about 60 yuan for 10-30V. The price is cheap, and the service life is long. It is estimated that it will be used several hundred thousand times. Hope to help you.
5. Yes, 28V. The VREF is 12V and the pull-up output voltage is 3.3V. If I want to use sn74lvch244a, how can I determine the pull-up resistance I need?
6. Slandered by the rumors.
7. We should form the habit of paying attention to hygiene< Autumn is a beautiful season in Beijing<
72. Liangliang won the glorious title of excellent young pioneers
73. The students are very active in learning< 74. Horses are running on the vast grassland
75. The teacher led us to participate in the children's calligraphy competition
76. Xiao Gang has become a glorious young pioneer
77. The living standard of the people has been improved
78. The students are very energetic in practicing calligraphy< In learning Chinese, we should form the habit of reading every day< Li Ming became a glorious Communist
81. The teacher led the students to watch the children's boat model exhibition
82. Xiaohong keeps a lovely kitten
83. We participated in the voluntary tree planting activities
84. The living standard of the people has been improved
85. Everyone should form the habit of hygiene< With the help of my teacher, I quickly corrected my mistakes
87. Before the exam, I have made full preparations< Mr. Zhang often encourages me to study hard
89. The hall is full of audience< The campus is full of white, red and yellow flowers
91. I stand on the playground and look at the exercise students carefully
92. Our class won the first place in the competition, and everyone's heart was filled with the joy of victory
93. In the group discussion, the speeches were very intense< They all said in one voice: "yes!"
95. Under the teacher's ecation, he corrected his learning attitude<
96. I like to read extracurricular books and magazines such as little bee, little stream and primary school students' study newspaper
97. After the reform and opening up, people's life has become more and more prosperous< I think the scenery in spring is very beautiful
99. The teacher asked the students to have a clear learning purpose and correct learning attitude< You must be serious and responsible< Mr. Li is very strict with us in class
102. After the implementation of quality ecation, the quantity and quality of our extracurricular reading have increased significantly
103. When I handed the cup, my mother's face showed a happy expression
104. Xiaoming's sister has been rated as "three good students" for three consecutive years
105. We came to the park to enjoy the beautiful scenery
106. Mr. Li has a very correct attitude towards us in class< His Chinese homework is basically complete. Basically or all can be removed
108. What just happened two years ago came to mind. After the implementation of quality ecation, the quantity and quality of our extracurricular reading have improved significantly. When I handed a cup of tea, my mother's face was filled with a happy mood. I'm sure it will snow tomorrow< We must pay attention to hygiene<
113. The clouds are reflected in the river and appear whiter
114. Xiangshan in autumn is a place that people yearn for
115. The museum displays newly unearthed cultural relics of 3000 years ago< This semester is the last year of my primary school life< My grandfather often tells us interesting stories of the past< My brother likes playing basketball and football best< The Spring Festival, which I look forward to day and night, has finally arrived
the reason why there are different ways to change some repetitive questions is that there are different ways to change them...
72. Liangliang won the glorious title of excellent young pioneers
73. The students are very active in learning< 74. Horses are running on the vast grassland
75. The teacher led us to participate in the children's calligraphy competition
76. Xiao Gang has become a glorious young pioneer
77. The living standard of the people has been improved
78. The students are very energetic in practicing calligraphy< In learning Chinese, we should form the habit of reading every day< Li Ming became a glorious Communist
81. The teacher led the students to watch the children's boat model exhibition
82. Xiaohong keeps a lovely kitten
83. We participated in the voluntary tree planting activities
84. The living standard of the people has been improved
85. Everyone should form the habit of hygiene< With the help of my teacher, I quickly corrected my mistakes
87. Before the exam, I have made full preparations< Mr. Zhang often encourages me to study hard
89. The hall is full of audience< The campus is full of white, red and yellow flowers
91. I stand on the playground and look at the exercise students carefully
92. Our class won the first place in the competition, and everyone's heart was filled with the joy of victory
93. In the group discussion, the speeches were very intense< They all said in one voice: "yes!"
95. Under the teacher's ecation, he corrected his learning attitude<
96. I like to read extracurricular books and magazines such as little bee, little stream and primary school students' study newspaper
97. After the reform and opening up, people's life has become more and more prosperous< I think the scenery in spring is very beautiful
99. The teacher asked the students to have a clear learning purpose and correct learning attitude< You must be serious and responsible< Mr. Li is very strict with us in class
102. After the implementation of quality ecation, the quantity and quality of our extracurricular reading have increased significantly
103. When I handed the cup, my mother's face showed a happy expression
104. Xiaoming's sister has been rated as "three good students" for three consecutive years
105. We came to the park to enjoy the beautiful scenery
106. Mr. Li has a very correct attitude towards us in class< His Chinese homework is basically complete. Basically or all can be removed
108. What just happened two years ago came to mind. After the implementation of quality ecation, the quantity and quality of our extracurricular reading have improved significantly. When I handed a cup of tea, my mother's face was filled with a happy mood. I'm sure it will snow tomorrow< We must pay attention to hygiene<
113. The clouds are reflected in the river and appear whiter
114. Xiangshan in autumn is a place that people yearn for
115. The museum displays newly unearthed cultural relics of 3000 years ago< This semester is the last year of my primary school life< My grandfather often tells us interesting stories of the past< My brother likes playing basketball and football best< The Spring Festival, which I look forward to day and night, has finally arrived
the reason why there are different ways to change some repetitive questions is that there are different ways to change them...
8. Both of them are the same as digital circuits and 7474. Their functions are the same, and their materials are different. H: high speed C: CMOS L: low power consumption s: Schottky
9. It is a buffer chip similar to 74hc125 / 74hc126, but it is characterized by 5V and 3.3V I / O buffer function, which is used for safe communication between 5V and 3.3V I / O voltage
10. Right click the property and set it again.
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